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All answers having "Worry" as clue:

3 Character Answers:

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AIL

EAT

NAG

NIL

RHO



4 Character Answers:

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AGER

CARE

FEAR

FRET

FUSS

STEW

TACT



5 Character Answers:

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ALARM

ANGST

BESET

BROOD

EATAT

NAGAT

NOTTO

SWEAT

TEASE



6 Character Answers:

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FIDGET

HARASS

HARRAS



7 Character Answers:

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AGONISE

ANGUISH

ANXIETY

CONCERN

PERTURB

SWEATIT



8 Character Answers:

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HEADACHE



9 Character Answers:

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LOSESLEEP

NIGHTMARE



10 Character Answers:

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HARASSMENT



11 Character Answers:

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GRANDMASTER